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hazards from volcanic eruptions are pyroclastic at speeds like a jetliner. man: [speaking spanish] jess phoenix: it will obliterate trees. it will take out people. it can even reshape the geology of the area. nobody can outrun a pyroclastic flow. if you are faced with one, you are dead. welcome to violent earth. i'm liev schreiber. more than 80% of the earth's surface was forged by volcanoes. they helped create fertile soil for agriculture, and volcanic gases helped form our atmosphere. without volcanoes, we would not have life on earth as we know it. all around the world, every sing...

major hazards? >> from volcanic eruptions are pyroclastic flows the rock fragments, and gases are moving at speeds like a jetliner it will it can even reshape the geology of the area. nobody can outrun a pyroclastic flow. if you are faced with one, you are dead. welcome to violent earth. i'm liev schreiber. more than 80% of the earth's surface was forged by volcanoes. they helped create fertile soil for agriculture, and volcanic gases helped form our atmosphere. without volcanoes, we would not have life on earth as we know it. all around the world, every single day, there are 40 to 5...